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Finding the Fourth Proportional to 78,789.11, 118,009.91 and 65,125.11

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Solution

The fourth proportional to 78,789.11, 118,009.91 and 65,125.11 is: 97,544.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,789.11 : 118,009.91 = 65,125.11 : x
  2. Step 2: Convert to fraction form
    78,789.11/118,009.91 = 65,125.11/x
  3. Step 3: Cross multiply
    78,789.11x = 118,009.91 × 65,125.11
  4. Step 4: Simplify right side
    78,789.11x = 7,685,408,975.19
  5. Step 5: Solve for x
    x = 7,685,408,975.19/78,789.11
  6. Step 6: Final answer
    x = 97,544.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.